Biology Forums - Study Force

By which of the following means are the nucleosides linked to one another in RNA and DNA molecules?
A.  They are linked together by alpha-glycosidic bonds.
B.  They are linked together by beta-glycosidic bonds.
C.  They are linked together by 5' phosphodiester bridges.
D.  They are linked together by 2',5' phosphodiester bridges.
E.  None of the other answers is correct.


Denaturation of double_stranded DNA with heat or alkali results in all of the following EXCEPT
A. decreased absorbance of the DNA at 260 nm.
B. loss of base stacking.
C. formation of single_stranded DNA.
D. disruption of hydrogen bonding.
E. a helix_to_coil transition.


The nucleosome is the basic repeating unit of chromatin.  Which of the following statements concerning nucleosomes is incorrect:
A.  nucleosomes have protein cores consisting of an octamer of protein subunits
B.  a segment of DNA approximately 145 bp long is associated with each nucleosome
C.  histone H1 contacts the DNA linker segments as they enter and leave the nucleosome
D.  the DNA in a nucleosome is packed tightly inside the protein core to conserve space in the nucleus and to protect the DNA from damage
E.  some nucleosomes form over specific regions of DNA in a non_random manner

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